Abrading machine



Nov; 14, 1939. A, N, EMMQNS I' 2.179.995

ABRADING MACHINE Filed March 2, 1938 3 Sheets-Sheet 1 M INVENTOR.

ATTORNEYS.

Nov. 14, 1939. A. N. EMMoNs 2,179,995

ABRDING MACHINE ,yl NVENTOIL` F Z- 'BY ATTORNEY Nov. 14, 1939. A. N.lEMMONS ABRADI-NG MACHINE Filed March 2, 1958 5 Sheets-Sheet 3 1'NVENTORATTORNEYS Patented Nov. 14, 1939 UNITED STATES PATENT FFIQE ABRADINGMACHINE Application March 2, 1938, Serial No. 193,54g

Claims.

This invention relates to abrading machines, and more particularly to acompact, light weight, machine particularly adapted for use inconnection with the renishing of oors in instances where it is notnecessary to sand the surface of the floor down to the original wood,but only necessary to thoroughly clean and smooth the surface of thefloor. For this purpose, the surface of the abrading drums is coveredwith an abrasive material that will not injure or mark up the surface ofthe floor, or destroy the effect of the filling in the iioor. For thispurpose, a covering of steel Wool tightly wound on the drum isparticularly advantageous. However, due to fact that the covering ofsteel wool on the abrading drum is of substantial thickness, and thefact that the steel wool breaks off and is rapidly thrown from the drum,floor abrading machines of conventional construction are not suitablefor use with such abrasive material.

This invention has as an object a machine of the type referred tocomprising a particularly compact and light structure which isconveniently manipulated, and which functions in a particularlyeiiicient manner.

More particularly, the invention has as an object a machine, as abovealluded to, consisting of a. one-piece integral, boxlike, frame in theforward end of which the abrading drum is completely housed, except fora small peripheral portion which extends through the bottom of thehousing for engagement with the iioor.

The invention has as a further object a particularly efficient suctionsystem for the collection of dust and particles of steel wool thrownfrom the drum, and being so arranged as to maintain its eiiciency as thediameter of the drum decreases With use.

The invention has as a further object a structure including theprovision kof means whereby the abrading drum can be quickly and connveniently removed and replaced, or other abrasive elements can besubstituted for the steel wool drum.

The invention consists in the novel features and in the combinations andconstructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanyingdrawings in which like characters designate co-rresponding parts in allthe views.

Figure l is a side elevational view of an abrading machine embodying myinvention.

Figure 2 is a top plan view with a portion of the top of the framebroken away.

Figure 3 is a front end elevational View with a portion of the framebroken away and the abrading drum shown in section.

The machine as here shown comprises an integral, one-piece, boxlike,frame, the forward 5 end of which is formed with a substantiallycylindrical abrading drum compartment i9.. The rear portion of the frameis formed with a fan compartment ll. The frame is piVo-tally supportedon a pair of rollers I2 arranged adjacent each 10 side of the frametoward the rear thereof on a shaft il! extending transversely of theframe between the depending sidesid, l5 thereof. The machine ismanipulated by a handle it secured in a bracket il detachably mounted onthe rear top surface of the frame, as by cap screws I8.

The depending side l5 of the frame is formed with an inwardly extendingboss i9 in which a shaft 2t is rotatably journalled in antiirictionbearings 2i. One end of the shaft extends out- 20 wardly through theside l5, and adrive pulley 22 is secured thereto, and the opposite endof the shaft Eil extends outwardly oflthe boss i9 toward the side walli4. The shaft 263 is arranged substantially centrally of the drumcompartment lll, and 25 the side wall M of the frame is formed with anopening 23 substantially coextensive with the drum compartment t0 permitinsertion and removal of the drum. The bottom wall of the drumcompartment is provided with an opening through which a small portion ofthe drum extends for engagement with the floor.

The drum 25, as here shown, is covered to a substantial thickness with alayer of steel Wool indicated at 25. The drum 25 is sleevable on a 35cylindrical member 2l which is preferably pressed upon the extendingportion of the shaft 2b and rotatably secured thereto asby a key 23. Thedrum 25 and cylindrical member 2l are preferably provided with one ormore keys o1' driving mem- 40 bers 38, and the drum is held on thecylindrical member by a disk 3i having a central aperture to receive thethreaded end of shaft 2l), and on which a nut 32 is threaded. The disk3l is of such diameter that its peripheral margin overlies the end ofthe drum 25.

The vacuum or suction system includes a fan 35 arranged in the fancompartment l l and mounted on a shaft 36 journalled in a cap 3l' inantifriction bearings 38. Ihe rear portion of the side wall l5 50 isformed with an aperture to permit installation of the fan, and the cap3l forms a closure for the aperture and is detachably secured to theframe as by screws 39. The outer end of the shaft 36 carries a drivepulley 40,

The abrading drum 25 and the fan 35 are driven by a motor 4| arranged ina concavity extending transversely of the frame intermediate theabrading drum chamber and the fan chamber. The motor 4| is pivotallymounted at one side to the top of the frame by pin 42, and the oppositeside of the motor is provided with an adjusting screw 43 coacting withthe forward portion of the frame to effect adjustment of the motor toproduce the proper tension on drive belts 44, 45, connecting the motorwith the abrading drum and fan respectively.

The suction system further includes a duct 46 extending from an aperture41 in the inner wall of the fan chamber Il forwardly to the rear side ofthe abrading drum chamber. The forward portion 48 of the side walls ofthe duct are outwardly and merge with the side walls I4, l5 at the rearof the drum compartment I0. The bottom wall of the duct 46 terminates at49, and a dust collecting pan 50 is arranged in this opening andconforms substantially therewith. The rear edge of the dust pan 55 ispivotally mounted to the frame at the forward edge 49 of the duct 46 ona rod 5|. With this arrangement, the forward end 52 of the pan 5D ismovable toward and from the floor and is yieldingly urged toward thefloor by a helical tension spring 53, one end of which is secured to therod i3, and the opposite end to a lug 54 secured to the under side ofthe pan. The under side of the pan is also' formed with a pair of spacedapart bosses 55 between which a roller is rotatably mounted, and whichmaintains the forward end 52 of the pan a predetermined fixed distancefrom the surface of the floor.

From the above, it will be noted that the pan 5l) is movableindependently of the tilting action of the frame and is maintained atthe proper distance from the floor, regardless of the wear of theabrading drum and the reduction in its diameter.

The top of the frame is provided with an aperture 60 constituting anoutlet for the fan chamber i l, and a discharge pipe 6I is secured tothe top of the frame in register with the opening 60, and to the upperend of which is secured a suitable dust collecting bag 62.

The front end of the frame is formed with a recess 63 forming acovenient hand grip for the front of the machine and which, togetherwith the inner handle I6, affords a convenient means of lifting andtransporting the machine about.

It will be understood that the machine is operated by tilting the sameforward on the rollers l2 after the motor has been turned on, thusbringing the drum 25 into engagement with the surface of the floor. Itwill be apparent that the machine described is particularly compact, andconsists of a minimum number of parts, and while the abrading drum iscompletely housed by the frame itself, the drum can be convenientlychanged, or other abrasive elements, such as a brush, may be quicklyattached to the machine.

What I claim is:

l. An abrading machine of the type described comprising a frame, anabrading drum journalled in the forward end of the frame, and a suctionfan mounted in the rear end of the frame, said frame being formed with asuction duct extending from said fan forwardly to the rear side of saiddrum. the bottom wall of the forward portion of said duct being formedwith an opening, a dust pan arranged in said opening and being pivotallymounted to the rear edge thereof, the forward edge of said pan beingprovided with means cooperable with the surface being finished tomaintain the forward end of said pan a predetermined distance from saidsurface, a motor mounted on the frame and motion transmitting meansconnecting said motor with the abrading drum and said fan.

2. An abrading machine of the type described comprising a frame, anabrading drum journalled in the forward end of the frame, and a suctionfan mounted in the rear end of the frame, said frame being formed with asuction duct extending forwardly from said fan and terminating adjacentand to the rear of said drum, the forward portion of the bottom wall ofsaid duct being formed with an opening, a dust collecting pan pivotallymounted to the rear edge of said opening and extending forwardly anddownwardly and forming a closure for said opening, means cooperable withsaid pan and frame to yieldingly urge the forward end of the pan towardthe surface being finished, and means carried by the pan and cooperablewith the surface being finished to maintain the forward end of the pan-apredetermined distance from said surface, a motor mounted on the frameand motion transmitting means connecting the motor with said drum andsaid fan.

3. An abrading machine of the type described comprising a frame, anabrading drum journalled in the forward end of the frame, and a suctionfan mounted in the rear end of the frame, said frame being formed with asuction duct extending forwardly from said fan and terminating adjacentto and at the rear of said abrading drum, the forward portion of saidduct flaring laterally to substantially the same width as the length ofthe abrading drum, and the bottom wall of said forward portion beingformed with an opening, a dust collecting pan pivoted to the rear edgeof said opening, said pan conforming to said opening and forming aclosure therefor, means cooperable with said pan and frame foryieldingly urging the forward end of the pan downwardly toward thesurface being finished, and a stop member carried by the pan andcooperable with tlie surface being finished to limit such downwardmovement, a motor mounted on the frame and motion transmitting meansconnecting said motor, the abrading drum and the fan.

4. An abrading machine of the type described comprising a frame providedwith rollers adjacent the rear end thereof for running on the surfacebeing inished, an abrading drum journalled in the forward end of theframe, a suction fan mounted in the rear portion of the frame, saidframe being formed with a suction duct extending from said fan forwardlyto the rear of said drum, the bottom wall of said duct terminating inspaced apart relation to said drum, a dust collecting pan interposedbetween said drum and the bottom wall of the duct and being movablymounted on the frame, said frame being tiltable on sail rollers to bringthe abrading drum into engagement with the surface being finished, saidpan being movable toward and from the surface being finishedindependently of the tilting action of the frame, a motor mounted on theframe and motion transmitting means connecting said motor with theabrading drum and the fan.

5. An abrading machine of the type described comprising a one-piece,integral, boxlike, frame, said frame being formed with an abrading drumcompartment in its forward end and a suction fan compartment in its rearend, one side of the frame being formed with an opening to permitinsertion and removal of the abrading drum in the drum compartment, andthe bottom wall of said compartment being formed with an opening, anabrading drum journalled in said drum compartment and depending throughthe opening in the bottom wall thereof, said frame being also formedwith a suction duct extending axially vfrom said fan chamber toward saiddrum compartment, the bottom wall of said duct being formed with anopening adjacent the rear side of the drum compartment, a dustcollecting pan arranged in said opening and being pivotally

